Centos7安装与卸载Docker

依赖配置：

1.查看是否有旧的安装包，如果有，需要卸载

yum remove docker docker-common docker-selinux docker-engine

2.检查内核版本（Docker 要求 CentOS 系统的内核版本高于 3.10）

[root@eric112 ~]# uname -r
4.17.8-1.el7.elrepo.x86_64

如果你的版本不满足需求，需要升级内核

方法一：通过yum安装

1.安装需要的软件包， yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的

yum install -y yum-utils device-mapper-persistent-data lvm2

2.添加docker的yum源

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

3.查看仓库中可用的docker版本，然后选择指定的版本安装

[root@eric112 ~]# yum list docker-ce --showduplicates | sort -r
Repository epel is listed more than once in the configuration
Repository epel-debuginfo is listed more than once in the configuration
Repository epel-source is listed more than once in the configuration
已加载插件：fastestmirror
可安装的软件包
 * updates: mirrors.aliyun.com
Loading mirror speeds from cached hostfile
 * extras: mirrors.aliyun.com
 * elrepo: mirrors.tuna.tsinghua.edu.cn
docker-ce.x86_64            18.06.0.ce-3.el7                    docker-ce-stable
docker-ce.x86_64            18.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            18.03.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.12.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.12.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.0.ce-1.el7.centos             docker-ce-stable
 * base: mirrors.aliyun.com

4.安装docker

yum install <FULLY-QUALIFIED-PACKAGE-NAME> #FULLY-QUALIFIED-PACKAGE-NAME为docker-ce-详细版本号，如docke-ce-17.06.2.ce-1.el7.centos

或者

yum install docker-ce #安装最新的稳定版

5.验证docker是否安装成功(有client和service两部分表示docker安装启动都成功了)

[root@eric112 ~]# docker version
Client:
 Version:           18.06.0-ce
 API version:       1.38
 Go version:        go1.10.3
 Git commit:        0ffa825
 Built:             Wed Jul 18 19:08:18 2018
 OS/Arch:           linux/amd64
 Experimental:      false

6.启动docker

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systemctl start docker #启动docker
systemctl enable docker #设置docker为开机自启

7.查看docker是否启动成功

[root@eric112 ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since 五 2018-08-03 23:06:03 CST; 5s ago
     Docs: https://docs.docker.com
 Main PID: 1450 (dockerd)
    Tasks: 28
   Memory: 50.2M
   CGroup: /system.slice/docker.service
           ├─1450 /usr/bin/dockerd
           └─1458 docker-containerd --config /var/run/docker/containerd/containerd.toml

方法二：通过脚本安装

curl -fsSL https://get.docker.com/ | sh  #最新正式版

或者

wget -qO- https://get.docker.com/ | sh  #最新正式版

或者

curl -fsSL https://test.docker.com/ | sh  #预发布版本，不建议在生成中使用

至此，docker安装启动成功。

卸载docker

1.查看已安装的docker

[root@eric112 ~]# yum list installed | grep docker
Repository epel is listed more than once in the configuration
Repository epel-debuginfo is listed more than once in the configuration
Repository epel-source is listed more than once in the configuration
docker-ce.x86_64                     18.06.0.ce-3.el7               @docker-ce-stable

2.使用yum卸载

yum remove -y docker-ce.x86_64   #docker-ce.x86_64为已安装的docker，以实际安装的版本为准

Centos7安装与卸载Docker

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